Schematic Reference: Interior Lights Schematics , Door Control Module Schematics , and Door Lock/Indicator Schematics in Doors

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Important: The sunload sensor assembly must indicate low light conditions for the interior lamps to operate.

1. Cover the sunload sensor assembly.
2. Turn ON the ignition, with the engine OFF.
3. Observe the courtesy lamps.
4. Open and close all of the doors and the rear compartment lid.
5. Turn the interior lamp switch ON and OFF.
6. Turn OFF the ignition.

Do the courtesy lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Observe the Photocell parameter in the climate control panel (CCP) Lighting data list.
4. Cover the sunload sensor assembly.

Does the Photocell voltage change?

Go to Step 4

Go to Twilight Sentinel Inoperative

With a scan tool command the Courtesy Lamp 1, 2 without dim output ON from the rear integration module (RIM) Output Control data list.

Do all of the interior courtesy lamps turn ON?

Go to Step 6

Go to Step 5

Are all of the interior courtesy lamps inoperative?

Go to Step 10

Go to Step 14

1. Turn the interior lamp switch ON.
2. With a scan tool, observe the Courtesy Lamp Switch parameter in the Dash Integration Module (DIM) Lighting Data List.

Does the scan tool display ON?

Go to Step 7

Go to Step 8

1. Open all the doors and the rear compartment lid.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe all the Door Jamb Sw. parameters in the Door Modules Inputs Data Lists.
4. With a scan tool, observe the Liftgate Lighting Switch parameter in the RIM Inputs Data List.

Does the scan tool display ON for all the Door Jamb Sw. and the Liftgate Lighting Switch parameters?

Go to Step 37

Go to Step 9

1. Disconnect the instrument panel (I/P) dimmer switch.
2. Connect a 3-amp fused jumper between the courtesy lamps switch on signal circuit of the interior lamp switch and the ground circuit of the interior lamp switch.
3. With a scan tool observe the Courtesy Lamp Switch parameter.

Does the scan tool display ON?

Go to Step 25

Go to Step 15

1. Turn OFF the ignition.
2. Disconnect the inoperative door lock actuator or door latch assembly - liftgate.
3. Connect a 3-amp fused jumper between the door open switch signal circuit of the door lock actuator or the rear compartment lid ajar switch circuit of the door latch assembly - liftgate and the ground circuit of the door lock actuator or door latch assembly - liftgate.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the appropriate inoperative Door Jamb Sw. or Liftgate Lighting Switch input parameter.

Does the scan tool display ON for the appropriate input?

Go to Step 23

Go to Step 17

1. Turn OFF the ignition.
2. Disconnect the interior lamp relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with the engine OFF.
4. Probe the interior lamp relay control side supply voltage circuit with a test lamp that connected to a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 30

Probe the interior lamp relay switch side supply voltage circuit with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 29

1. Connect a test lamp between the interior lamp relay control side supply voltage circuit and the courtesy lamp relay control circuit.
2. With a scan tool command the Courtesy Lamp 1, 2 without dim output ON and OFF.

Does the test lamp turn ON and OFF with each command?

Go to Step 13

Go to Step 21

1. Connect a 10-amp fused jumper between the switch side supply voltage circuit of the interior lamp relay and the courtesy lamp supply voltage circuit of the interior lamp relay.
2. With a scan tool, command the Courtesy Lamp 1, 2 without dim ON.

Do the interior lamps illuminate?

Go to Step 22

Go to Step 19

1. Turn ON the courtesy lamps.
2. Remove the inoperative courtesy lamp bulb.
3. Connect a test lamp between the inoperative courtesy lamp supply voltage circuit and the ground circuit of the inoperative courtesy lamp.

Does the test lamp illuminate?

Go to Step 28

Go to Step 19

Test the courtesy lamp switch on signal circuit for high resistance, open or short to power. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 16

Test the interior lamp switch ground circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 26

Test the appropriate door open switch signal circuit of the inoperative door lock actuator or the rear compartment lid ajar switch circuit of the door latch assembly - liftgate for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 18

Test the inoperative door jamb switch or door latch assembly - liftgate ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 24

Test the interior lamp supply voltage circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 20

Test the courtesy lamp control circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 27

Test the relay control circuit for a high resistance, an open, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 27

Inspect for poor connections at the interior lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 31

Inspect for poor connections at the harness connector of the appropriate door lock actuator or door latch assembly - liftgate. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 32

Inspect for poor connections at the harness connector of the appropriate door module or RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 33

Inspect for poor connections at the harness connector of the I/P dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 34

Inspect for poor connections at the harness connector of the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 35

Inspect for poor connections at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 36

Inspect for poor connections at the inoperative courtesy lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 38

Go to Step 37

Repair the open, high resistance, or short to ground in the switch side supply voltage circuit of the interior lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

Repair the high resistance or open in the control side supply voltage circuit of the interior lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 38

--

Replace the interior lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 38

--

Replace the appropriate door lock actuator or door latch assembly - liftgate. Refer to Front Side Door Latch Replacement or Rear Side Door Latch Replacement in Doors and Liftgate Latch Replacement in Body Rear End.

Did you complete the replacement?

Go to Step 38

--

Important: Perform the setup procedure for the RIM.

Replace the inoperative door module or the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 38

--

Replace I/P dimmer switch. Refer to Instrument Panel Lamp Dimmer Switch Replacement .

Did you complete the replacement?

Go to Step 38

--

Important: After replacement perform the setup procedure for the DIM.

Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 38

--

Important: After replacement perform the setup procedure for the RIM.

Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 38

--

Replace the inoperative courtesy lamp bulb.

Did you complete the replacement?

Go to Step 38

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2